A plume of heat sucked out of Africa by Storm Kathleen this weekend will push the mercury towards a summer-like 70F. ‘Heatwave’ conditions baking central Europe and the southern Continent will brush northern Europe raising temperatures across Britain. Warmth will be driven in part by a powerful storm set to unleash 70mph gales, rain and snow over the next 48 hours. Kathleen, named by Met Eireann, will barrel into Britain ahead of the weekend, prompting the UK Met Office to issue a raft of severe weather warnings. When the storm passes to the north, however, it will join forces with high pressu…